Stochastic Methods for Nonlinear Rotordynamics With Uncertainties

Edoardo Peradotto (1) , Alfonso Panunzio (2) , Loic Salles (3) , Christoph W Schwingshackl (3)

1 Polito - Politecnico di Torino = Polytechnic of Turin
2 MSSMat - Laboratoire de mécanique des sols, structures et matériaux
3 Department of Mechanical Engineering [Imperial College London]

The calculated dynamic response of an excited rotating system can be significantly affected by uncertainties in its mechanical properties, such as mass, stiffness, geometrical imperfections, or loadings. For this reason, it is essential to understand and quantify the influence of uncertain parameters on the predicted rotor response. This paper aims to optimize the propagation of random input uncertainties for a rotordynamic problem and assess their influence on the dynamic behaviour of an unbalanced rotor. The Harmonic balance method (HBM) and a non-intrusive Polynomial Chaos Expansion (PCE) are used to evaluate the stochastic response of a finite element rotor. The proposed stochastic approach is based on a numerical quadrature calculation of integrals for finding the coefficients of the PCE.

Domaines: Vibrations [physics.class-ph]

Edoardo Peradotto, Alfonso Panunzio, Loic Salles, Christoph W Schwingshackl. Stochastic Methods for Nonlinear Rotordynamics With Uncertainties. ASME Turbo Expo 2015: Turbine Technical Conference and Exposition, Jun 2015, Montreal, Canada. ⟨10.1115/GT2015-43534⟩. ⟨hal-02556332⟩